[U-Boot] [PATCH 1/9] arm926ej-s: Invalidate instruction cache in flush_cache

Michael Spang
2011-03-17T19:46:55Z

If U-Boot is loaded from RAM and the OS is loaded into an overlapping
region, the instruction cache is not coherent when that OS is started.
We must therefore invalidate the instruction cache in addition to
cleaning the data cache.

Signed-off-by: Michael Spang <mspang@csclub.uwaterloo.ca>
---
arch/arm/lib/cache.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/arm/lib/cache.c b/arch/arm/lib/cache.c
index 30686fe..047786a 100644
--- a/arch/arm/lib/cache.c
+++ b/arch/arm/lib/cache.c
@@ -37,6 +37,8 @@ void flush_cache (unsigned long dummy1, unsigned long dummy2)
asm("0: mrc p15, 0, r15, c7, c10, 3\n\t" "bne 0b\n" : : : "memory");
/* disable write buffer as well (page 2-22) */
asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (0));
+ /* invalidate icache for coherence with cleaned dcache */
+ asm("mcr p15, 0, %0, c7, c5, 0" : : "r" (0));
#endif
#ifdef CONFIG_OMAP34XX
void v7_flush_cache_all(void);
--
1.7.2.3